BLAST NINJA® NOZZLES

Developed through extensive research in collaboration with the U.S. Air Force and Office of Naval Research, these nozzles minimize noise production by lowering the air exit velocity without compromising particle velocity.

Kenametal’s Blast Ninja Nozzles represent a breakthrough in abrasive blasting technology, combining durability with advanced noise reduction features. Engineered with a durable carbide insert construction, these nozzles are expected to last up to 500 hours, similar to tungsten carbide nozzles, while offering strip rates comparable to standard venturi nozzles.

Their innovative design not only decreases noise levels by up to 17 dB(A) but also enhances operator safety and compliance with OSHA noise regulations. By addressing noise at the source, the Blast Ninja Nozzles reduce the risk of hearing damage, lower noise citations, and increase productive work time.

OSHA has implemented noise exposure limits for the worker’s health and safety. Exposure to high levels of noise can lead to: hearing loss, tinnitus (ringing in the ear), stress, anxiety, high blood pressure, gastrointestinal problems, and chronic fatigue. As a rule of thumb, every 3 dB change represents a halving of sound energy.

At 115 dB, the average volume of abrasive blasting operations, OSHA regulations allow for just 15 minutes of exposure. Operator downtime creates excess costs associated with an idle asset. Per OSHA requirements, better hearing protection does not reduce worker noise exposure. Only by reducing sound at its source will a worker experience non-hazardous noise.

In certain conditions, Blast Ninja can meet OSHA’s noise standard compliance 29 CFR 1910.95 of four hours of exposure, meaning that operators are protected, and productive work time is improved. The standard uses a 5 dBA exchange rate; so for every 5 dBA TWA increase in noise permissible exposure time is cut in half. The reduction in employee exposure to hazardous noise to below the OSHA 8-Hour Time Weighted Average alleviates employer’s need to modify employees’ current practices, reduces the likelihood of injury in the case of PPE failure, and ensures that personnel in adjacent “safe zones” are guaranteed to be safe from exposure.